With new Nutritional Fact label requirements taking effect in 2020, Coca-Cola is testing Coca-Cola Stevia, which will be sweetened only with the natural ingredient stevia. A potential showstopper for this product is likely to be: With new Nutritional Fact label requirements taking effect in 2020, Coca-Cola is testing Coca-Cola Stevia, which will be sweetened only with the natural ingredient stevia. A potential showstopper for this product is likely to be: Previous products with stevia sweetener had a bitter aftertaste. Cannibalization of the company's existing sodas. A lack of advertising on television. A lower profit margin due to the added costs of expensive ingredients